Adding images from Draw works, and they can be deleted. However, after adding a caption such as "[None]Figure 1", the image can be deleted; but the space it occupied remains. The caption moves to the top of the reserved image space. The caption itself can be deleted; but I can find no way to remove the box which contained the image -- the space appears to be permanently reserved.
ARGH! The bounding box can be selected and moved/deleted like an image. Not immediately intuitive.